Selective soldering machines are frequently enclosed and run a nitrogen-only environment. It improves wetting and the solder stays clean. Bob On Sat, Mar 21, 2015, at 12:22 PM, NOPE9 YES wrote: > How well does it work ? >=20 > gus in Denver --=20 http://www.fastmail.com - Does exactly what it says on the tin --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .